[Siguza]

It's actually neither TOCTOU nor double fetch, it's not checking anything at all, it's just write-then-fetch using shared (untrusted) memory to store trusted information. Sure similar in nature, but not really fitting any common name...

[blinkingled]

I see - I will give it a full read little later - I like your writing style based on what I've glanced over so far!

[caf]

TOWTTOU (with s/check/write)?